This would be a Haradrim warrior riding a giant elephant known as a Mumak in J.R.R. Tolkien’s Middle Earth mythos, the setting of his famous Lord of the Rings novel series. The people called Haradrim are basically the stand-ins for African people in Tolkien’s world, occupying the region to Middle Earth’s south. Unfortunately, as might be expected for a story authored by a White Englishman back in the 1950s, the Haradrim (as well as the Asian-based people of Rhun to the east) were mostly fighting on behalf of the bad guys against the heroic European stand-ins. The racist implications of that setup should be obvious to any modern observer, but, to be fair, Tolkien doesn’t seem have been as extreme in those attitudes as some others of his day (he was anti-Nazi at least).
By the way, my portrayal of the Mumak was inspired in part by the prehistoric Palaeoloxodon namadicus, a cousin of the modern African forest elephant which may have been the biggest elephant species known to exist.